存在参考站位置误差的三星时差定位算法  

A Tri-satellite TDOA Localization Algorithm Using Reference Stations at Inaccurate Locations

作　　者：任凯强 孙正波 REN Kai-qiang;SUN Zheng-bo(National Key Laboratory of Science and Technology on Blind Signal Processing,Chengdu Sichuan 610041,China)

机构地区：[1]盲信号处理重点实验室

出　　处：《计算机仿真》2019年第9期62-65,172,共5页Computer Simulation

摘　　要：在三星时差定位系统中,通常需引入位置已知的参考站来校正星历误差和时间同步误差对定位精度的影响,然而当参考站位置存在误差时,便无法实现高精度校正。为解决上述问题,首先推导了存在参考站位置误差、星历误差和时间同步误差时三星时差定位系统的定位精度CRLB。然后利用线性均方最小均方误差(Linear Minimum Mean Square Error,LMMSE)估计准则对参考站位置误差进行估计,并对参考站位置进行更新;最后将更新后的参考站位置带入定位方程,减少参考站位置误差对定位精度的影响。仿真结果表明,上述算法可以有效降低参考站位置误差,且对目标辐射源定位精度可达克拉美-罗界(Cramer-Rao Lower Bound,CRLB)。Reference stations,whose locations are known,are always used to calibrate location error caused by ephemeris error and synchronization error in tri-satellite TDOA localization system.When the exact locations of reference stations are not available,it is unable to the calibrate location error of the target source.Firstly,the paper derived the CLRB of tri-satellite TDOA localization system with reference station location error ephemeris error and synchronization error,then,proposed an algorithm based on LMMSE to estimate the location error of reference stations.Finally,the refined locations of reference stations were used in the localization equations of target source to reduce the location errors caused by location error of reference stations.Simulation results demonstrate that location error of the proposed algorithm can reach CRLB.

关 键 词：三星时差定位系统 参考站位置误差 星历误差、时间同步误差 克拉美-罗界 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]